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Java TreeMap size() Method with Example

TreeMap Class size() method: Here, we are going to learn about the size() method of TreeMap Class with its syntax and example.
Submitted by Preeti Jain, on February 29, 2020

TreeMap Class size() method

  • size() method is available in java.util package.
  • size() method is used to return the size of this TreeMap or in other words, we can say it returns the number of key-value pairs that exist in this TreeMap.
  • size() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
  • size() method does not throw an exception at the time of returning size.


    public int size();


  • It does not accept any parameter.

Return value:

The return type of the method is int, it returns the number of existing key-value pairs in this TreeMap.


// Java program to demonstrate the example 
// of int size() method of TreeMap 

import java.util.*;

public class SizeOfTreeMap {
    public static void main(String[] args) {
        // Instantiates TreeMap
        TreeMap < Integer, String > tm = new TreeMap < Integer, String > ();

        // By using put() method is
        // to put the key-value pairs in
        // treemap tm
        tm.put(1, "C");
        tm.put(4, "C++");
        tm.put(3, "Java");
        tm.put(2, "Php");

        // Display TreeMap tm
        System.out.println("tm: " + tm);

        // By using size() method is to 
        // return the size of this TreeMap

        int size = tm.size();

        // Display size of TreeMap tm
        System.out.println("tm.size(): " + size);


tm: {1=C, 2=Php, 3=Java, 4=C++}
tm.size(): 4

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